Electric heating – Metal heating – By arc
Patent
1981-07-24
1984-03-27
Albritton, C. L.
Electric heating
Metal heating
By arc
219121LL, B23K 2700
Patent
active
044396635
ABSTRACT:
In the perforation of sheet material by light energy, a continuous focused laser beam is reflected from different locations along the beam axis to provide separate pulsed beams and the beams are issued onto the sheet material with the same beam cross-sectional area. In one aspect, the lengths of respective different light paths for conveyance of light from the point of focus of the laser to final image locations are made equal. In another aspect, different focusing elements may be included in light paths to provide for sameness of beam cross-sectional area at the final image locations. The light paths are preferably provided in part by light conducting apparatus having light-reflective elements mounted for movement, such that different perforation matrices may be readily attained.
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Brooks Ulysses A.
Claflin Warren E.
Lilly, Jr. A. Clifton
Martin Peter
Stultz Edward B.
Albritton C. L.
Philip Morris Incorporated
Shaw Robert M.
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